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import java.io.IOException;   
  
import javax.servlet.Filter;   
import javax.servlet.FilterChain;   
import javax.servlet.FilterConfig;   
import javax.servlet.ServletException;   
import javax.servlet.ServletRequest;   
import javax.servlet.ServletResponse;   
  
public class SetCharacterEncodingFilter implements Filter {   
  
protected String encoding = null;   
  
protected FilterConfig filterConfig = null;   
  
protected boolean ignore = true;   
  
// ÉèÖÃÉêÇë¶ÔÏóµÄֵΪ¿Õ£¬ÓÐÀûÓÚÄÚ´æ×ÊÔ´µÄ¿ìËÙÊÍ·Å   
public void destroy() {   
    this.encoding = null;   
    this.filterConfig = null;   
}   
  
// filterµÄÖ÷Ìå²Ù×÷   
public void doFilter(ServletRequest request, ServletResponse response,   
     FilterChain chain) throws IOException, ServletException {   
    // ÅжÏÊÇ·ñÐèÒª½øÐбàÂëµÄÉèÖà   
    if (!ignore || request.getCharacterEncoding() == null) {   
     // µÃµ½ÅäÖÃÎļþÖеıàÂëÀàÐÍ   
     String encoding = setEncoding(request);   
     if (encoding != null) {   
      request.setCharacterEncoding(encoding);   
     }   
    }   
   &


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